In electronics a NOT gate is more commonly called an inverter. The circle on the symbol is called a bubble, and is used in logic diagrams to indicate a logic negation between the external logic state and the internal logic state (1 to 0 or vice versa).
A weather watch, on the other hand, typically refers to an alert issued to indicate that conditions are favorable for the development of dangerous weather patterns, although the dangerous weather conditions themselves are not currently present.
User Login. Watch vs. Warning: What's the Difference. With the severe weather season underway, now is a good time to go over the difference between tornado and severe thunderstorm watches and warnings. A WATCH means that the potential exists for the development of severe thunderstorms or tornadoes, depending upon the specific type of watch issued.